One API Does Not Mean One Protocol: Chat Completions, Responses, Messages, and Gemini
This story is from 2026-08-30. It is preserved in the archive; the latest stories are on the live feed.
"OpenAI compatible" is useful shorthand, but it is not a complete integration contract. Two clients can accept the same API key and base domain while sending different request paths, authentication headers, payload shapes, streaming events, and tool-call formats. That difference matters when you co…
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- 2026-08-30 10:40 · DEV Community — AI
One API Does Not Mean One Protocol: Chat Completions, Responses, Messages, and Gemini